Description
An asphalt roofing felt made of a specially formulated organic sheet which has been fully saturated
with waterproofing asphalt. This product is strong, flexible and impervious to water penetration, but
will allow water vapour to pass through at a restricted rate. Preconditioned to help it lay flat and
remain stable after installation on a roof deck. Guidelines are provided every 2" across the sheet
to aid the roofer in keeping asphalt shingles aligned.

Uses
No. 15, non-perforated, asphalt felt is designed to be used as an all-purpose protective waterproof
sheet in construction projects. Can be installed as a temporary roof cover during house
construction and then serve as a permanent shingle underlayment after shingles are installed. Can
also act as temporary protection if shingle blow-off occurs. May also be used as a waterproof
breather sheet on side-walls beneath outer finish. (Check local building codes.)